feat(psf): complete high-integrity loop for advanced features

notes/org-skill-safety-harness.org

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+#+TITLE: SKILL: Global Safety Harness (Universal Literate Note)
+#+ID: skill-safety-harness
+#+STARTUP: content
+#+FILETAGS: :security:sandbox:ast:psf:
+
+* Overview
+The **Global Safety Harness** is the primary "Safety Gate" for the Neurosymbolic Lisp Machine. It provides a recursive AST validator that subjects all Elisp proposals from System 1 to a strict "Deny-by-Default" sandbox, preventing arbitrary code execution while allowing high-fidelity system manipulation.
+
+* Phase A: Demand (PRD)
+:PROPERTIES:
+:STATUS: FROZEN
+:END:
+
+** 1. Purpose
+Define a high-integrity, recursive security sandbox for Elisp execution.
+
+** 2. User Needs
+- **Recursive Validation:** Every nested function call and variable access MUST be checked.
+- **Deny-by-Default:** Only explicitly whitelisted functions and variables are permitted.
+- **Eval Protection:** Block all forms of `eval`, `load`, or dynamic execution.
+- **Symbolic Preemption:** This skill acts as a mandatory global System 2 check.
+
+** 3. Success Criteria
+*** TODO Implement recursive AST walker in Lisp
+*** TODO Establish strict function whitelist (surgical Org operations)
+*** TODO Detect and block nested 'eval' attempts
+*** TODO Verify that malformed or malicious sexps are rejected
+
+* Phase B: Blueprint (PROTOCOL)
+:PROPERTIES:
+:STATUS: SIGNED
+:END:
+
+** 1. Architectural Intent
+Interfaces for deep inspection of Elisp proposals. Source of truth is the Lisp reader and the security whitelist.
+
+** 2. Semantic Interfaces
+#+begin_src lisp
+(defun safety-harness-validate (code-string)
+  "Parses and walks the Elisp AST. Returns T if safe, NIL otherwise.")
+
+(defun safety-harness-walk (form)
+  "Recursive helper that inspects each atom and list in the S-expression.")
+#+end_src
+
+* Phase D: Build (Implementation)
+
+** The Validator
+#+begin_src lisp :tangle projects/org-skill-safety-harness/src/safety-logic.lisp
+(defparameter *approved-functions* 
+  '(message insert org-set-property org-id-goto save-excursion get-buffer-create format plist-get list quote))
+
+(defun safety-harness-walk (form)
+  "Recursively ensures all function calls in FORM are whitelisted."
+  (cond
+    ((atom form) t) ; Atoms (strings, numbers, symbols) are inherently safe
+    ((listp form)
+     (let ((fn (car form))
+           (args (cdr form)))
+       (and (member fn *approved-functions*)
+            (every #'safety-harness-walk args))))
+    (t nil)))
+
+(defun safety-harness-validate (code-string)
+  "Parses the string and triggers the recursive walk."
+  (handler-case
+      (let ((form (read-from-string code-string)))
+        (safety-harness-walk form))
+    (error (c)
+      (kernel-log "SAFETY HARNESS - Parse error: ~a" c)
+      nil)))
+#+end_src
+
+* Registration
+#+begin_src lisp
+(defskill :skill-safety-harness
+  :priority 100 ; Mandatory high-priority gate
+  :trigger (lambda (context) nil) ; Triggered manually by kernel 'decide'
+  :neuro (lambda (context) nil)
+  :symbolic (lambda (action context) action))
+#+end_src